Packet Traversal - How far?

[gary.smith () ScottishAmicable co uk]

Wizards:

This may be a fairly trivial question, and if so I apologise, but does
anyone know of any tool or strategy for accomplishing the following?

The scenario:

User ->Router (with ACLS)->Firewall->Router (with ACLS) ->Firewall->Router
(with ACLS) -> Application Server

The problem:

User tries to connect to Application Server and connections timeout.  Only
part of the infrastructure is housed internally, therefore, cannot check
rules/logs for all devices.  Port scanner won't help as something is
discarding packets (rather than rejecting them).  

Does anyone know whether there is an implementation (preferably Win32
[albeit cygwin+winpcap]) of Traceroute that uses TCP?  

--Gary;   






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